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private void dataGridView1_CellMouseEnter(object sender, DataGridViewCellEventArgs e)
{
if (e.RowIndex >= 0)
dataGridView1.Rows[e.RowIndex].DefaultCellStyle.BackColor = Color.Blue;
}
private void dataGridView1_CellMouseLeave(object sender, DataGridViewCellEventArgs e)
{
Color defaultColor = dataGridView1.BackgroundColor;
if (e.RowIndex >= 0)
dataGridView1.Rows[e.RowIndex].DefaultCellStyle.BackColor = DefaultBackColor;
}